Mattress cushion



FIG. 1 is a front view of a mattress cushion, showing our new design;

FIG. 2 is a side elevational view of the right hand side thereof, the opposite left hand side being substantially identical;

FIG. 3 is an elevational view of the bottom side thereof;

FIG. 4 is an elevational view of the top side thereof;

FIG. 5 is an enlarged detail view in side elevation, taken in the area designated by numeral 5 in FIG. 2;

FIG. 6 is an enlarged detail view in side elevation, taken in the area designated by numeral 6 in FIG. 3;

FIG. 7 is an enlarged detail view in side elevation, taken in the area designated by numeral 7 in FIG. 2;

FIG. 8 is an enlarged fragmentary top side perspective view of the area designated by numeral 5 in FIG. 2; and,

FIG. 9 is an enlarged fragmentary top side perspective view of the design taken in the area designated by numeral 7 in FIG. 2.

The rear of the design is flat and unornamented. 

The ornamental design for a mattress cushion, as shown and described. 